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POST
/
v1
/
custom_block_deploys
Create a custom block deploy
curl --request POST \
  --url https://api.notion.com/v1/custom_block_deploys \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Notion-Version: <notion-version>' \
  --data '
{
  "checksum_crc32": "<string>"
}
'
{
  "object": "<string>",
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "upload_url": "<string>",
  "upload_url_expires_at": "2023-11-07T05:31:56Z"
}
This is an internal/undocumented endpoint. It is not part of the public API and may change without notice. Do not rely on this endpoint for production integrations.

Authorizations

​
Authorization
string
header
required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Headers

​
Notion-Version
enum<string>
required

The API version to use for this request. The latest version is 2026-03-11.

Available options:
2026-03-11

Body

application/json
​
checksum_crc32
string
required

Base64-encoded big-endian CRC32 checksum of the gzipped tarball that will be uploaded to upload_url.

Required string length: 8
Example:

"DUoRhQ=="

Response

​
object
string
required

The type of object, always 'custom_block_deploy'.

Allowed value: "custom_block_deploy"
​
id
string<uuid>
required

UUID identifying this custom block deploy.

​
upload_url
string
required

Presigned S3 PUT URL for uploading the deploy tarball (source.tar.gz).

​
upload_url_expires_at
string<date-time>
required

When upload_url stops being valid (ISO8601).